Hey guys, I have a couple of other questions.
As I was going on with my 2nd skein of yarn I noticed the weird bumps pictured. Hopefully you know what I'm talking about, they are kinda fuzzy. It was like two ends had been tied together or something. What are these and what should I do about them?

Also, I've not tried to weave in the ends on anything yet. Should I do anything differently because the yarn is pretty bulky?